Plugins are only loaded after configuration, try instead.
Updated my gitconfig, thanks @mathiasbynens for the inspiration.

* Added git aliases to show contributions to a repository, ordered by number of
  commits.
* Removed git-template, didn't work as I expected anyway.
* Added convenience git alises to list all tags, branches and remotes.
* Some more convenience settings to make the work flow more comfortable.
* Still not enough cowbell though...